A question about onUploadsCleared

[PGriffith]

You can't invoke component extension methods yourself.

In 8.1.18 you'll be able to invoke a clearUploads() scripting function manually, if that's what you're trying to do:

Nightly 8.1 Changelogs - 2022

Nightly Changelog: 8.1.18-b20220524 Perspective 3351: File Upload: Implement clearUploads() component method Added clearUploads() script function to the FileUpload Component. Platform 5392: Add formatting pattern / replacement tokens for manual and scheduled backup filename generation Scheduled backups (as well as manually downloaded backups) now feature a customizable filename pattern with optional placeholders such as ${os}, ${version}, ${gatewayName}, ${edition} and ${timestamp}.